How to determine if Facebook user has changed using PFUser object

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I'm using Parse to handle my login via Facebook. When a user logs in, their Facebook is associated with the PFUser object. However, if a user exits the app, logs out of Facebook and into Facebook with a different account, and then reopens the app, what's the best way to check if the Facebook user has changed?

[PFUser currentUser] gets the logged in user from disk, so this won't have changed...

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